Magnetization study of polycrystalline YBa2AlxCu(3−x)O7−δ (x = 0.05, 0.10 and 0.20) compounds期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Magnetization study of polycrystalline YBa₂Al_xCu_(3−x)O_7−δ (x = 0.05, 0.10 and 0.20) compounds

Authors:	H R Kerchner Yang Ren Sun J R Thompson H R Khan J O Thomson D K Christen

Institution:	^a Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6061, USA ^b Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996-1200, USA ^c Forschunginstitut für Edelmetalle und Metallchemie, D-73525, Schwäbisch-Gmünd, Germany

Abstract:	Superconductivity in polycrystalline YBa₂Al_xCu_(3−x)O_7−δ materials was characterized by dynamic AC and quasistatic DC magnetometry. Intragranular persistent current density and low-loss intergranular critical current density were deduced using DC and AC techniques, respectively. Addition of aluminum produced modest increases in the intragranular persistent current for x < 0.2, but drastically reduced the intergranular critical current density for x = 0.2. The critical temperature T_c for superconductivity decreased only 4% for Al content up to x = 0.2.

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